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Engine Specific Info and Questions => IDI Engine => Topic started by: dieseldunebuggy on January 17, 2008, 10:54:05 am

Title: Where to put pyrometer
Post by: dieseldunebuggy on January 17, 2008, 10:54:05 am

I'm making a exhaust header for my 1981 vw rabbit with dual outlets for dual exhaust. Where should I put the pyrometer in the header for a good reading?

Title: Where to put pyrometer
Post by: jimfoo on January 17, 2008, 11:54:47 am

Close to the head. You will loose heat dramatically the further away you are.

Title: Where to put pyrometer
Post by: dieseldunebuggy on January 17, 2008, 01:49:34 pm

Which cylinder would be the best one to put the sending unit.

Title: Where to put pyrometer
Post by: jimfoo on January 17, 2008, 02:32:08 pm

I'd think #2

Title: Where to put pyrometer
Post by: DonGTI on January 17, 2008, 09:21:00 pm

curious... any reason why  No2?

Title: Where to put pyrometer
Post by: vanagonturbo on January 17, 2008, 09:25:41 pm

Well cause Nitrogendioxide would be a really hard place to mount something solid :D

Oh, sorry. I would say 1 or 2 because they get the hottest. Farthest away from the oil pump and such.

Title: Where to put pyrometer
Post by: burn_your_money on January 17, 2008, 10:27:44 pm

I would think #2 or #3. They always seem to crap out first in my experience. Install 4 pyros :)

Title: Where to put pyrometer
Post by: jimfoo on January 18, 2008, 06:46:04 am

After my sand experiment, I'd say #3 gets the most air, so might run slightly cooler than #2, which is my basis for #2 over #3. Of course air doesn't have the mass of sand so it may be more equal than I give it credit for.

Title: Where to put pyrometer
Post by: dieseldunebuggy on January 18, 2008, 08:52:45 am

I have ported and polished the head. Knowing that would you still say #2 cylinder over #3 cylinder.